/*
 * (C) Copyright 2001
 * Raymond Lo, lo@routefree.com
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

/*
 * Support for harddisk partitions.
 *
 * To be compatible with LinuxPPC and Apple we use the standard Apple
 * SCSI disk partitioning scheme. For more information see:
 * http://developer.apple.com/techpubs/mac/Devices/Devices-126.html#MARKER-14-92
 */

#include <linux/fs.h>

// ucore
#include <ide.h>

#include "part_dos.h"

/* Convert char[4] in little endian format to the host format integer
 */
static inline int le32_to_int(unsigned char *le32)
{
	return ((le32[3] << 24) + (le32[2] << 16) + (le32[1] << 8) + le32[0]
	    );
}

static inline int is_extended(int part_type)
{
	return (part_type == 0x5 || part_type == 0xf || part_type == 0x85);
}

static void print_one_part(dos_partition_t * p, int ext_part_sector,
			   int part_num)
{
	int lba_start = ext_part_sector + le32_to_int(p->start4);
	int lba_size = le32_to_int(p->size4);

	printk("%5d\t\t%10d\t%10d\t%2x%s\n",
	       part_num, lba_start, lba_size, p->sys_ind,
	       (is_extended(p->sys_ind) ? " Extd" : ""));
}

static int test_block_type(unsigned char *buffer)
{
	if ((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
	    (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa)) {
		return (-1);
	}			/* no DOS Signature at all */
	if (strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET], "FAT", 3) == 0 ||
	    strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET], "FAT32",
		    5) == 0) {
		return DOS_PBR;	/* is PBR */
	}
	return DOS_MBR;		/* Is MBR */
}

int test_part_dos(struct ide_device *dev_desc)
{
	unsigned char buffer[dev_desc->blksz];

	if ((dev_desc->read_secs(dev_desc, 0, (unsigned long *)buffer, 1) != 0)
	    || (buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55)
	    || (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa)) {
		return (-1);
	}
	return test_block_type(buffer);
}

/*  Print a partition that is relative to its Extended partition table
 */
static void print_partition_extended(struct ide_device *dev_desc,
				     int ext_part_sector, int relative,
				     int part_num)
{
	unsigned char buffer[dev_desc->blksz];
	dos_partition_t *pt;
	int i;

	if (dev_desc->read_secs
	    (dev_desc, ext_part_sector, (unsigned long *)buffer, 1) != 0) {
		printk("** Can't read partition table on %d:%d **\n",
		       dev_desc->dev, ext_part_sector);
		return;
	}
	i = test_block_type(buffer);
	if (i == -1) {
		printk("bad MBR sector signature 0x%02x%02x\n",
		       buffer[DOS_PART_MAGIC_OFFSET],
		       buffer[DOS_PART_MAGIC_OFFSET + 1]);
		return;
	}
	if (i == DOS_PBR) {
		printk("    1\t\t         0\t%10ld\t%2x\n",
		       dev_desc->lba, buffer[DOS_PBR_MEDIA_TYPE_OFFSET]);
		return;
	}
	/* Print all primary/logical partitions */
	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
	for (i = 0; i < 4; i++, pt++) {
		/*
		 * fdisk does not show the extended partitions that
		 * are not in the MBR
		 */

		if ((pt->sys_ind != 0) &&
		    (ext_part_sector == 0 || !is_extended(pt->sys_ind))) {
			print_one_part(pt, ext_part_sector, part_num);
		}

		/* Reverse engr the fdisk part# assignment rule! */
		if ((ext_part_sector == 0) ||
		    (pt->sys_ind != 0 && !is_extended(pt->sys_ind))) {
			part_num++;
		}
	}

	/* Follows the extended partitions */
	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
	for (i = 0; i < 4; i++, pt++) {
		if (is_extended(pt->sys_ind)) {
			int lba_start = le32_to_int(pt->start4) + relative;

			print_partition_extended(dev_desc, lba_start,
						 ext_part_sector ==
						 0 ? lba_start : relative,
						 part_num);
		}
	}

	return;
}

/*  Print a partition that is relative to its Extended partition table
 */
static int get_partition_info_extended(struct ide_device *dev_desc,
				       int ext_part_sector, int relative,
				       int part_num, int which_part,
				       ucore_disk_partition_t * info)
{
	unsigned char buffer[dev_desc->blksz];
	dos_partition_t *pt;
	int i;

	if (dev_desc->read_secs
	    (dev_desc, ext_part_sector, (unsigned long *)buffer, 1) != 0) {
		printk("** Can't read partition table on %d:%d **\n",
		       dev_desc->dev, ext_part_sector);
		return -1;
	}
	if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
	    buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
		printk("bad MBR sector signature 0x%02x%02x\n",
		       buffer[DOS_PART_MAGIC_OFFSET],
		       buffer[DOS_PART_MAGIC_OFFSET + 1]);
		return -1;
	}

	/* Print all primary/logical partitions */
	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
	for (i = 0; i < 4; i++, pt++) {
		/*
		 * fdisk does not show the extended partitions that
		 * are not in the MBR
		 */
		if (((pt->boot_ind & ~0x80) == 0) &&
		    (pt->sys_ind != 0) &&
		    (part_num == which_part) &&
		    (is_extended(pt->sys_ind) == 0)) {
			info->blksz = 512;
			info->start = ext_part_sector + le32_to_int(pt->start4);
			info->size = le32_to_int(pt->size4);
			switch (dev_desc->if_type) {
			case IF_TYPE_IDE:
			case IF_TYPE_SATA:
			case IF_TYPE_ATAPI:
				sprintf((char *)info->name, "hd%c%d",
					'a' + dev_desc->dev, part_num);
				break;
			case IF_TYPE_SCSI:
				sprintf((char *)info->name, "sd%c%d",
					'a' + dev_desc->dev, part_num);
				break;
			case IF_TYPE_USB:
				sprintf((char *)info->name, "usbd%c%d",
					'a' + dev_desc->dev, part_num);
				break;
			case IF_TYPE_DOC:
				sprintf((char *)info->name, "docd%c%d",
					'a' + dev_desc->dev, part_num);
				break;
			default:
				sprintf((char *)info->name, "xx%c%d",
					'a' + dev_desc->dev, part_num);
				break;
			}
			/* sprintf(info->type, "%d, pt->sys_ind); */
			sprintf((char *)info->type, "U-Boot");
			return 0;
		}

		/* Reverse engr the fdisk part# assignment rule! */
		if ((ext_part_sector == 0) ||
		    (pt->sys_ind != 0 && !is_extended(pt->sys_ind))) {
			part_num++;
		}
	}

	/* Follows the extended partitions */
	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
	for (i = 0; i < 4; i++, pt++) {
		if (is_extended(pt->sys_ind)) {
			int lba_start = le32_to_int(pt->start4) + relative;

			return get_partition_info_extended(dev_desc, lba_start,
							   ext_part_sector ==
							   0 ? lba_start :
							   relative, part_num,
							   which_part, info);
		}
	}
	return -1;
}

void print_part_dos(struct ide_device *dev_desc)
{
	printk("Partition     Start Sector     Num Sectors     Type\n");
	print_partition_extended(dev_desc, 0, 0, 1);
}

int get_partition_info_dos(struct ide_device *dev_desc, int part,
			   ucore_disk_partition_t * info)
{
	return get_partition_info_extended(dev_desc, 0, 0, 1, part, info);
}
